TPS40140 datasheet(16/65 Pages) TI | DUAL OR 2-PHASE, STACKABLE CONTROLLER

Part #	TPS40140

Description	DUAL OR 2-PHASE, STACKABLE CONTROLLER

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5.4 TRACK (SOFT-START WITHOUT PRE-BIASED OUTPUT)

T

SS + CSS

58

103

(1)

5.5 SOFT-START WITH PRE-BIASED OUTPUTS

t1 +

C

SS

6 mA

V

OUT

R

BIAS

R1 ) RBIAS

(2)

t2 +

C

SS

12 mA

0.7 V *

V

OUT

R

BIAS

R1 ) RBIAS

(3)

T

SS + t1 ) t2

(4)

TPS40140

DUAL OR 2-PHASE, STACKABLE CONTROLLER

SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006

A capacitor connected to the TRKx pins sets the power-up time. When UVLO_CEx is high and the internal

power-on reset (POR) is cleared, the calibrated current source, starts charging the external soft start

capacitor with 12-

µA. The PGOOD pin is held low during the start up. The rising voltage across the

capacitor serves as a reference for the error amplifier, U10 and U14. When the soft start voltage reaches

the level of the reference voltage, VREF = 0.7 V, the converter’s output reaches the regulation point and

further voltage rise of the soft-start voltage has no effect on the output. When the soft start voltage

reaches 1.4 V, the powergood (PGOOD) function is cleared to be reported on the PGOOD pin. Normally

the PGOOD pin goes high at this time. Equation 1 is used to calculate the value of the soft-start capacitor.

Css is in Farads and Tss is given in seconds.

For pre-biased outputs the TPS40140 uses two levels of soft-start current that charge the soft-start

capacitor connected to the TRKx pin(s). PWM switching begins when the TRKx voltage rises to the

voltage present on the FBx pin. When the first PWM pulse occurs, the charging current is increased to 12

µA. Figure 5-2 shows the typical waveforms present on the TRACKx pin and the output voltage, VOUT

when VOUT is pre-biased. TRKx rises due to the 6

µA current, until at T1 the voltage on TRKx equals the

pre-biased voltage on the FBx pin, at time t1. At this time the soft-start current is increased to 12

µA and

TRKx rises with an increase in it's slope. When TRKx reaches 0.7 V, at time t2, the output should be in

regulation. The voltage on the TRKx pin continues to rise. When the TRKx voltage is 1.4 V, at time t3, the

PGOODx signal is enabled. The TRKx voltage continues to rise to 2.4 V where is is clamped internally.

This approach provides for an accurate detection of the threshold where FBx = TRKx. Figure 5-3 is a

block diagram of the implementation. The calculation for the soft start time, due to pre-bias, includes the

time from t0 to t1, plus the time from t1 to t2, as shown in Equation 2 through Equation 4.

where

• Css is in Farads

• Tss is in seconds

If there is no pre-bias (V

OUT = 0 V), the equation reduces to case without pre-bias.

APPLICATION INFORMATION

16

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